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Audible alarm device and fire alarm system including the same

An audio alarm and fire technology, applied in the direction of alarms, fire alarms, fluids using vibration, etc., can solve the problem of not helping to increase the useless current consumption of the piezoelectric buzzer, unable to increase the sound pressure of the buzzer, and increasing consumption Current and other issues, to achieve low cost, suppress the peak current consumption, and reduce the effect of current consumption

Inactive Publication Date: 2011-08-17
NOHMI BOSAI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the switching transistor, which is a switching element, is turned on and the coil is energized to store energy, the magnetic flux is saturated at a certain point of time, and no more energy can be stored. Therefore, after the magnetic flux of the coil is saturated, even if the current flows in the coil However, the reverse voltage of the coil will not increase, and the sound pressure of the buzzer cannot be increased after the moment when the magnetic flux of the coil reaches saturation.
On the other hand, even after the reverse voltage of the coil does not increase, the current increases due to the characteristics of the coil, so the current consumption increases.
That is, useless current consumption that does not contribute to raising the sound pressure of the piezoelectric buzzer is generated

Method used

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  • Audible alarm device and fire alarm system including the same
  • Audible alarm device and fire alarm system including the same
  • Audible alarm device and fire alarm system including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0041] In Embodiment 1, the case where the acoustic alarm device of the present invention is used in fire alarm equipment is described as an example. The fire alarm equipment has a so-called R-type fire signal receiver, and the R-type fire signal receiver is By sending and receiving transmission signals (pulse signals), when a fire signal detected by a fire detector, etc. is received, a fire alarm is issued. fire alarm equipment

[0042] (the whole frame)

[0043] First, the fire alarm device according to Embodiment 1 will be described.

[0044] figure 1 It is the whole block diagram of the fire alarm system of Embodiment 1. figure 2 It is a block diagram explaining the structure of the fire alarm system of this Embodiment 1. Various terminal devices are connected to the fire signal receiver FA through the signal line SG.

[0045] exist figure 1Among them, photoelectric analog detector SE11, thermal analog detector SE12, addressable transmitter SE13, audio alarm device ...

Embodiment approach 2

[0124] In Embodiment 1 described above, an example in which the frequency of the voltage applied to the piezoelectric buzzer is swept within a predetermined range was shown. In Embodiment 2, duty ratio control is also performed on the voltage applied to the piezoelectric buzzer. In addition, in this second embodiment, the description will focus on differences from the above-mentioned first embodiment, and the same reference numerals will be used for the same or corresponding components as those of the first embodiment.

[0125] Figure 7 It is a graph showing the on / off waveform of the transistor 35 and the charging waveform of the coil 33 when the frequency of the applied voltage is changed. Figure 7 (a1), (b1), and (c1) represent the ON / OFF waveforms of the switching parts, and the transistor 35 is turned off when the line is on the lower side, and the transistor 35 is on when the line is on the upper side. Figure 7 (a2), (b2), and (c2) represent the charging current wav...

Embodiment approach 3

[0133] In the fire alarm equipment of Embodiment 1 mentioned above, the fire signal receiver FA and the sound alarm device C11 are connected by the signal line SG, and are also connected by the power supply line PG. That is, the acoustic alarm device C11 receives power for sounding the piezoelectric buzzer 32 from the power line PG.

[0134] In this Embodiment 3, the fire alarm apparatus which used the signal line SG as a power line at the same time is demonstrated as an example. In addition, in this third embodiment, the description will focus on the points of difference from the above-mentioned first embodiment, and the same reference numerals will be used for the same or corresponding components as those of the first embodiment.

[0135] Figure 8 It is a circuit configuration diagram of the fire signal receiver FA and the sound alarm device C11 of the fire alarm equipment of Embodiment 3.

[0136] Such as Figure 8 As shown, the fire signal receiver FA and the sound ala...

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Abstract

Provided is an audible alarm device including a piezoelectric buzzer, which is capable of suppressing wasted current consumption not contributing to increased sound pressure of the piezoelectric buzzer. The audible alarm device includes: a piezoelectric buzzer (32); a coil (33) connected in parallel to the piezoelectric buzzer (32); a current limiting means (34) for adjusting a current supply period for the piezoelectric buzzer (32) and the coil (33), and limiting a current to the coil (33) during current supply; and a control circuit (31) for controlling on / off time of the current limiting means (34).

Description

technical field [0001] The present invention relates to an audible alarm device that sounds a piezoelectric buzzer, and fire alarm equipment having the audible alarm device. Background technique [0002] Conventionally, a piezoelectric buzzer driving method in which a booster coil and a piezoelectric element are connected in parallel at the output end of a switching transistor is known (for example, refer to Patent Document 1). [0003] In addition, there is an alarm device that "changes the sounding frequency of the piezoelectric buzzer by changing the frequency of the voltage output to the piezoelectric buzzer" (for example, refer to Patent Document 2). [0004] Patent Document 1 Japanese Patent Laid-Open Publication No. Sho 57-210396 (page 2, figure 1 ) [0005] Patent Document 2 Japanese Patent Laid-Open Publication No. 2009-59137 (page 2, page 5, Figure 4 ) [0006] According to the technology described in Patent Document 1, energy (storage) as magnetic energy is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K9/122G08B3/10G08B17/00
CPCG10K9/122B06B1/0238
Inventor 野口贵弘
Owner NOHMI BOSAI LTD